Added chatbot feature

[Adhetya]

🛠️ Fixes Issue #153

Closes #153

👨‍💻 Changes proposed

• Added chatbot which can answer questions related to the website.

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

📷 Screenshots

Video demo

https://user-images.githubusercontent.com/20537150/170877821-305b207d-121c-40be-8234-907acb020553.mp4

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Name	Status	Preview	Updated
big-b-e-learn-websit-e	✅ Ready (Inspect)	Visit Preview	May 29, 2022 at 3:35PM (UTC)